Vibration motor

Abstract

A vibration motor having an eccentric weight 20 includes a tubular metal holder frame 30 with a flat bottom part 31 and a wall surface 32 , the flat bottom part 31 having an inner projection 31 f with a bottom-up recess part W, the upper wall surface 32 being domed; a pair of external terminal pieces 14 and 15 attached to a plastic end cap 13 , wherein the plastic end cap 13 has spacer projections 13 b and 13 c inserted between the motor case 11 and the flat bottom part 31.

1. A vibration motor comprising:
 a vibration motor main body provided with a motor shaft projected from a motor case, an eccentric weight being attached to said motor shaft; 
 a metal holder frame having a tubular shape, the tubular shape surrounding the vibration motor main body and comprising a flat bottom part and a wall surface, said flat bottom part having an inner projection with a bottom-up recess part, said wall surface having a domed profile rising up from both-side edges of said flat bottom part; and 
 a plastic end cap including a pair of external terminal pieces attached to the plastic end cap for closing an opening of the motor case at an end opposite to said eccentric weight; wherein 
 said plastic end cap integrally and unitarily includes a pair of spacer parts inserted between and abutting against said motor case and the inner sides of the both-side edges of said flat bottom part to exert wedge pressure. 
 
   
   
     2. The vibration motor as claimed in  claim 1 , wherein said metal holder frame integrally and unitarily comprises tapered projections each having a rectangular cross section, said tapered projections being projected to the both sides of said eccentric weight from the both-side edges of said flat bottom part.